// Copyright (C) 2004-2021 Artifex Software, Inc.

//

// This file is part of MuPDF.

//

// MuPDF is free software: you can redistribute it and/or modify it under the

// terms of the GNU Affero General Public License as published by the Free

// Software Foundation, either version 3 of the License, or (at your option)

// any later version.

//

// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more

// details.

//

// You should have received a copy of the GNU Affero General Public License

// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>

//

// Alternative licensing terms are available from the licensor.

// For commercial licensing, see <https://www.artifex.com/> or contact

// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,

// CA 94129, USA, for further information.

#include "mupdf/fitz.h"

#include "draw-imp.h"

#include "pixmap-imp.h"

#include <string.h>

void fz_init_aa_context(fz_context *ctx)

{

#ifndef AA_BITS

  ctx->aa.hscale = 17;

  ctx->aa.vscale = 15;

  ctx->aa.scale = 256;

  ctx->aa.bits = 8;

  ctx->aa.text_bits = 8;

#endif

}

int

fz_aa_level(fz_context *ctx)

{

  return fz_aa_bits;

}

int

fz_graphics_aa_level(fz_context *ctx)

{

  return fz_aa_bits;

}

int

fz_text_aa_level(fz_context *ctx)

{

  return fz_aa_text_bits;

}

int

fz_rasterizer_graphics_aa_level(fz_rasterizer *ras)

{

  return fz_rasterizer_aa_bits(ras);

}

int

fz_rasterizer_text_aa_level(fz_rasterizer *ras)

{

  return fz_rasterizer_aa_text_bits(ras);

}

void

fz_set_rasterizer_text_aa_level(fz_context *ctx, fz_aa_context *aa, int level)

{

#ifdef AA_BITS

  if (level != fz_aa_bits)

  {

    if (fz_aa_bits == 10)

      fz_warn(ctx, "Only the Any-part-of-a-pixel rasterizer was compiled in");

    else if (fz_aa_bits == 9)

      fz_warn(ctx, "Only the Centre-of-a-pixel rasterizer was compiled in");

    else

      fz_warn(ctx, "Only the %d bit anti-aliasing rasterizer was compiled in", fz_aa_bits);

  }

#else

  if (level > 8)

    aa->text_bits = 0;

  else if (level > 6)

    aa->text_bits = 8;

  else if (level > 4)

    aa->text_bits = 6;

  else if (level > 2)

    aa->text_bits = 4;

  else if (level > 0)

    aa->text_bits = 2;

  else

    aa->text_bits = 0;

#endif

}

void

fz_set_rasterizer_graphics_aa_level(fz_context *ctx, fz_aa_context *aa, int level)

{

#ifdef AA_BITS

  if (level != fz_aa_bits)

  {

    if (fz_aa_bits == 10)

      fz_warn(ctx, "Only the Any-part-of-a-pixel rasterizer was compiled in");

    else if (fz_aa_bits == 9)

      fz_warn(ctx, "Only the Centre-of-a-pixel rasterizer was compiled in");

    else

      fz_warn(ctx, "Only the %d bit anti-aliasing rasterizer was compiled in", fz_aa_bits);

  }

#else

  if (level == 9 || level == 10)

  {

    aa->hscale = 1;

    aa->vscale = 1;

    aa->bits = level;

  }

  else if (level > 6)

  {

    aa->hscale = 17;

    aa->vscale = 15;

    aa->bits = 8;

  }

  else if (level > 4)

  {

    aa->hscale = 8;

    aa->vscale = 8;

    aa->bits = 6;

  }

  else if (level > 2)

  {

    aa->hscale = 5;

    aa->vscale = 3;

    aa->bits = 4;

  }

  else if (level > 0)

  {

    aa->hscale = 2;

    aa->vscale = 2;

    aa->bits = 2;

  }

  else

  {

    aa->hscale = 1;

    aa->vscale = 1;

    aa->bits = 0;

  }

  aa->scale = 0xFF00 / (aa->hscale * aa->vscale);

  fz_set_rasterizer_text_aa_level(ctx, aa, level);

#endif

}

void

fz_set_aa_level(fz_context *ctx, int level)

{

  fz_set_rasterizer_graphics_aa_level(ctx, &ctx->aa, level);

  fz_set_rasterizer_text_aa_level(ctx, &ctx->aa, level);

}

void

fz_set_text_aa_level(fz_context *ctx, int level)

{

  fz_set_rasterizer_text_aa_level(ctx, &ctx->aa, level);

}

void

fz_set_graphics_aa_level(fz_context *ctx, int level)

{

  fz_set_rasterizer_graphics_aa_level(ctx, &ctx->aa, level);

}

void

fz_set_graphics_min_line_width(fz_context *ctx, float min_line_width)

{

  ctx->aa.min_line_width = min_line_width;

}

float

fz_graphics_min_line_width(fz_context *ctx)

{

  return ctx->aa.min_line_width;

}

float

fz_rasterizer_graphics_min_line_width(fz_rasterizer *ras)

{

  return ras->aa.min_line_width;

}

fz_irect

fz_bound_rasterizer(fz_context *ctx, const fz_rasterizer *rast)

{

  fz_irect bbox;

  const int hscale = fz_rasterizer_aa_hscale(rast);

  const int vscale = fz_rasterizer_aa_vscale(rast);

  if (rast->bbox.x1 < rast->bbox.x0 || rast->bbox.y1 < rast->bbox.y0)

  {

    bbox = fz_empty_irect;

  }

  else

  {

    bbox.x0 = fz_idiv(rast->bbox.x0, hscale);

    bbox.y0 = fz_idiv(rast->bbox.y0, vscale);

    bbox.x1 = fz_idiv_up(rast->bbox.x1, hscale);

    bbox.y1 = fz_idiv_up(rast->bbox.y1, vscale);

  }

  return bbox;

}

fz_rect fz_scissor_rasterizer(fz_context *ctx, const fz_rasterizer *rast)

{

  fz_rect r;

  const int hscale = fz_rasterizer_aa_hscale(rast);

  const int vscale = fz_rasterizer_aa_vscale(rast);

  r.x0 = ((float)rast->clip.x0) / hscale;

  r.y0 = ((float)rast->clip.y0) / vscale;

  r.x1 = ((float)rast->clip.x1) / hscale;

  r.y1 = ((float)rast->clip.y1) / vscale;

  return r;

}

static fz_irect fz_clip_rasterizer(fz_context *ctx, const fz_rasterizer *rast)

{

  fz_irect r;

  const int hscale = fz_rasterizer_aa_hscale(rast);

  const int vscale = fz_rasterizer_aa_vscale(rast);

  r.x0 = fz_idiv(rast->clip.x0, hscale);

  r.y0 = fz_idiv(rast->clip.y0, vscale);

  r.x1 = fz_idiv_up(rast->clip.x1, hscale);

  r.y1 = fz_idiv_up(rast->clip.y1, vscale);

  return r;

}

int fz_reset_rasterizer(fz_context *ctx, fz_rasterizer *rast, fz_irect clip)

{

  const int hscale = fz_rasterizer_aa_hscale(rast);

  const int vscale = fz_rasterizer_aa_vscale(rast);

  if (fz_is_infinite_irect(clip))

  {

    rast->clip.x0 = rast->clip.y0 = BBOX_MIN;

    rast->clip.x1 = rast->clip.y1 = BBOX_MAX;

  }

  else {

    rast->clip.x0 = clip.x0 * hscale;

    rast->clip.x1 = clip.x1 * hscale;

    rast->clip.y0 = clip.y0 * vscale;

    rast->clip.y1 = clip.y1 * vscale;

  }

  rast->bbox.x0 = rast->bbox.y0 = BBOX_MAX;

  rast->bbox.x1 = rast->bbox.y1 = BBOX_MIN;

  if (rast->fns.reset)

    return rast->fns.reset(ctx, rast);

  return 0;

}

void *fz_new_rasterizer_of_size(fz_context *ctx, int size, const fz_rasterizer_fns *fns)

{

  fz_rasterizer *rast = fz_calloc(ctx, 1, size);

  rast->fns = *fns;

  rast->clip.x0 = rast->clip.y0 = BBOX_MIN;

  rast->clip.x1 = rast->clip.y1 = BBOX_MAX;

  rast->bbox.x0 = rast->bbox.y0 = BBOX_MAX;

  rast->bbox.x1 = rast->bbox.y1 = BBOX_MIN;

  return rast;

}

fz_rasterizer *fz_new_rasterizer(fz_context *ctx, const fz_aa_context *aa)

{

  fz_rasterizer *r;

  int bits;

#ifdef AA_BITS

  bits = AA_BITS;

#else

  if (aa == NULL)

    aa = &ctx->aa;

  bits = aa->bits;

#endif

  if (bits == 10)

    r = fz_new_edgebuffer(ctx, FZ_EDGEBUFFER_ANY_PART_OF_PIXEL);

  else if (bits == 9)

    r = fz_new_edgebuffer(ctx, FZ_EDGEBUFFER_CENTER_OF_PIXEL);

  else

    r = fz_new_gel(ctx);

#ifndef AA_BITS

  r->aa = *aa;

#endif

  return r;

}

void fz_convert_rasterizer(fz_context *ctx, fz_rasterizer *r, int eofill, fz_pixmap *pix, unsigned char *colorbv, fz_overprint *eop)

{

  fz_irect clip = fz_bound_rasterizer(ctx, r);

  clip = fz_intersect_irect(clip, fz_pixmap_bbox_no_ctx(pix));

  clip = fz_intersect_irect(clip, fz_clip_rasterizer(ctx, r));

  if (!fz_is_empty_irect(clip))

    r->fns.convert(ctx, r, eofill, &clip, pix, colorbv, eop);

}